edited by Bruce A. Thyer and John S. Wodarski
John Wiley, 2007
Buku Teks
Pritchard, Colin, author
Routledge, 2006
Buku Teks
Drisko, James W., author
Springer, 2012
eBooks
Grinnell, Richard M., author
Oxford University Press, 2018
Buku Teks
Golightley, Malcom, author
Learning matters Ltd., 2008
Buku Teks